Falling inhibitor

Abstract

To provide a falling suppressing tool which is excellent in workability.SOLUTION: A falling suppressing tool (1) includes: a first mounting member (2) having a contact part (21) arranged so as to be brought into contact with a structure, a support part (26) extending downward along a suspension bolt (P) from the contact part (21), and a sandwiching part (30) which sandwiches a suspension bolt (P) with the support part (26); a second mounting member (7) which is fixed to the suspension bolt (P) on a lower side of the first mounting member (2); and a wire member (10) which is provided over the first mounting member (2) and the second mounting member (7).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a fall prevention device and a fall prevention structure.

Background Art

[0002] For example, indoor units of air-conditioning equipment, lighting equipment, cable racks, and other suspended equipment may be suspended and supported at the four corners by suspension bolts hanging from a structure such as a ceiling slab. At this time, in each span, two brace bolts are arranged in an X shape between adjacent suspension bolts and fixed to the suspension bolts, and the whole is reinforced to suppress the swinging movement of the suspended equipment caused by an earthquake or the like. Many measures are often taken.

[0003] However, even if such measures are taken, in the case where a large vibration exceeding the assumption occurs, a situation may occur where the suspended equipment falls due to the breakage of the suspension bolt itself. For this reason, in case of such an emergency, a fall prevention device for preventing the fall of suspended equipment suspended and supported by a suspension bolt hanging from a structure may be provided. An example of such a fall prevention device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2020-37965 (Patent Document 1).

[0004] The fall prevention device of Patent Document 1 includes a first attachment member (first attachment member 5) fixed near the suspension point above the suspension bolt (fully threaded bolt 2), a second attachment member (second attachment member 6) fixed below the suspension bolt, and a wire member (metal wire 4) provided across the first attachment member and the second attachment member. The first attachment member of this Patent Document 1 is composed of a round or U-shaped thin metal fitting, and is clamped and fixed vertically between a structure (ceiling 1 or suspension point anchor 33) or another nut (intermediate tool 34) by a nut (nut 19) screwed onto the suspension bolt.

[0005] However, in such a structure, when fixing the first attachment member to the suspension bolt, it is necessary to perform a nut tightening operation on the suspension bolt near the suspension point on the upper side of the suspension bolt. Such an operation has to be carried out manually, which poses a problem of poor workability. In addition, there is a possibility that the suspension bolt breaks above the first attachment member. In such a case, there is a problem that the fall arrester can no longer perform its function.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, it is desired to realize a fall arrester that is excellent in workability and can sufficiently prevent the suspended equipment from falling even if the suspension bolt breaks.

Means for Solving the Problems

[0008] The fall arrester according to the present invention is a fall arrester for preventing the fall of suspended equipment suspended and supported by a suspension bolt hanging down from a structure, comprising a contact portion arranged to contact the structure, a support portion extending downward along the suspension bolt from the contact portion, and a clamping portion for clamping the suspension bolt between the support portion, a first attachment member; a second attachment member fixed to the suspension bolt below the first attachment member; and a wire member provided across the first attachment member and the second attachment member. It is provided with.

[0009] According to this configuration, by simply bringing the contact portion into contact with the structure and sandwiching the suspension bolt between the support portion and the clamping portion, the first attachment member can be easily fixed to the suspension bolt above the suspension bolt. Therefore, the workability can be improved. Further, by sandwiching the suspension bolt between the support portion and the clamping portion while bringing the contact portion into contact with the structure, the structure and the first attachment member can be made to function as an integral rigid body. Therefore, even if the suspension bolt breaks when a large vibration acts, the break position can be made below the first attachment member to which the wire member is attached, and the falling of the suspended equipment can be sufficiently prevented.

[0010] Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiment examples described below.

[0011] As one aspect, It is preferable that the first attachment member further includes a first brace clamping portion that sandwiches a first brace bolt intersecting the suspension bolt between the support portion, and a second brace clamping portion that sandwiches a second brace bolt intersecting the suspension bolt between the clamping portion, separately from the first brace bolt.

[0012] According to this configuration, when fixing by bridging two brace bolts that intersect each other between adjacent suspension bolts to prevent the suspended equipment from swaying, the device for preventing sway can be used also for this purpose. Therefore, the overall structure is simple, and it is possible to prevent the suspended equipment from swaying and to prevent it from falling in case of an emergency.

[0013] As one aspect, It is preferable that the second attachment member has a device attachment portion that is fastened together with the attachment portion of the suspended equipment to the suspension bolt.

[0014] According to this configuration, by clamping the equipment mounting portion to the mounting portion of the suspending equipment with respect to the suspension bolt, the second mounting member can be easily fixed to the suspension bolt below the first mounting member. Further, since it is only necessary to configure the equipment mounting portion so that it can be clamped to the mounting portion of the suspending equipment, the structure of the second mounting member can be simplified.

[0015] As one aspect, It is preferable that the second mounting member includes a second support portion arranged along the suspension bolt and a second clamping portion that sandwiches the suspension bolt between the second support portions.

[0016] According to this configuration, by simply sandwiching the suspension bolt between the second support portion and the second clamping portion, the second mounting member can be easily fixed to the suspension bolt even below the first mounting member. Therefore, the workability can be further improved.

[0017] As one aspect, A nut is attached to the suspension bolt in a state of abutting against the structure, It is preferable that the abutting portion has a notch larger than the outer shape of the nut.

[0018] According to this configuration, interference with the nut attached to the suspension bolt in a state of abutting against the structure is avoided by the notch, and the abutting portion can be stably abutted against the structure. Therefore, the mounting posture of the first mounting member with respect to the suspension bolt can be stabilized.

[0019] As one aspect, The first mounting member further includes a connecting bolt that connects the support portion and the clamping portion, The wire member has an annular portion formed annularly at at least one end, It is preferable that the connecting bolt connects the support portion and the clamping portion in a state of being inserted through the annular portion.

[0020] According to this configuration, by using the configuration of connecting the support portion and the clamping portion with a connecting bolt in the first mounting member and inserting the connecting bolt through the annular portion formed in the wire member, the first mounting member and the wire member can be connected without specially providing a hole for passing the wire member in the first mounting member.

[0021] In addition, the fall prevention structure according to the present invention is a fall prevention structure for preventing the fall of suspended equipment suspended and supported at four corners by four suspension bolts hanging down from a structure, two brace bolts are respectively arranged in a span between two adjacent suspension bolts in a posture where they cross each other in an X shape, in each of the suspension bolts, at different positions in the vertical direction, the suspension bolt and the two brace bolts crossing it are respectively connected using corner fittings, a first mounting member that sandwiches the suspension bolt in a state of being in contact with the structure, a second mounting member fixed to the suspension bolt below the upper corner fitting, a first wire member provided across the first mounting member and the second mounting member, a third mounting member fixed to the suspension bolt below the second mounting member and above the lower corner fitting, a fourth mounting member fixed to the suspension bolt below the third mounting member, a second wire member provided across the third mounting member and the fourth mounting member, and includes.

[0022] According to this configuration, a first unit having a first attachment member, a second attachment member, and a first wire member, and a second unit having a third attachment member, a fourth attachment member, and a second wire member can be independently attached to two upper and lower corner brackets provided on each suspension bolt. For example, when attaching a single fall arrester across the vicinity of a structure and the vicinity of suspended equipment, it is necessary to adjust the length of the wire member according to the suspension height of the suspended equipment from the structure. However, with the above structure, adjustment of the length of the wire member becomes unnecessary. Therefore, the workability when constructing using a fall arrester can be improved. Further, since the first attachment member sandwiches the suspension bolt while being in contact with the structure, the structure and the first attachment member can function as an integral rigid body. Therefore, even if the suspension bolt breaks when a large vibration acts, the break position can be made below the first attachment member to which the first wire member is attached, and it is possible to sufficiently prevent the suspended equipment from falling.

[0023] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments described with reference to the drawings.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0025]

First Embodiment

[0026] FIG. 1 shows a suspension support structure for suspending and supporting a suspended equipment E on a structure S. As shown in this figure, this support structure is formed by connecting attachment sites Ea provided on the side surfaces of the suspended equipment E to respective ones of a plurality (for example, four) of suspension bolts P extending downward along the vertical direction from the structure S. The structure S is, for example, a concrete ceiling slab, a beam, or the like. The suspended equipment E is, for example, an indoor unit of an air conditioner, a lighting device, a cable rack, or the like. Hereinafter, a structure in which an indoor unit of an air conditioner (an example of the suspended equipment E) is suspended and supported by four suspension bolts P vertically provided from a ceiling slab (an example of the structure S) will be described as an example.

[0027] Among the four suspension bolts P, pairs of suspension bolts P facing each other in the left - right direction and the front - rear direction are each connected by two brace bolts Q intersecting each other. The suspension bolt P and the two brace bolts Q intersecting it are connected to each other by the fall arrester 1 of this embodiment near the structure S. The suspension bolt P and the two brace bolts Q are connected to each other by a corner fitting C near the lower - side suspended equipment E. Also, in each span, the two brace bolts Q are connected in a posture of intersecting each other in an X - shape. These two brace bolts Q are connected to each other by a cross fitting X. Thus, a structure is formed that can suppress the swinging movement of the suspended equipment E caused by an earthquake or the like.

[0028] In addition, as the corner fitting C and the cross fitting X, known fittings of various methods such as a sandwiching method, a leaf spring method, and a double nut method can be appropriately used.

[0029] Thus, although the suspension support structure of the present embodiment can suppress the swinging movement of the suspended equipment E, in order to prevent the suspended equipment E from falling even when an unexpected large vibration occurs, the fall arrester 1 is configured to further perform a fall arrest function. In other words, the fall arrester 1 of the present embodiment is configured to also serve as a corner fitting that connects the suspension bolt P and the two brace bolts Q intersecting therewith at the corner portion, and an instrument for preventing the suspended equipment E from falling.

[0030] As shown in FIGS. 2 and 3, the fall arrester 1 of the present embodiment includes a first attachment member 2, a second attachment member 7, and a wire member 10. The first attachment member 2 includes a base fitting 20, a clamping fitting 30, a first brace clamping fitting 50, and a second brace clamping fitting 60. The first attachment member 2 is fixed to the suspension bolt P near the structure S. The second attachment member 7 includes an equipment attachment fitting 70. The second attachment member 7 is fixed to the suspension bolt P near the suspended equipment E below the first attachment member 2. The wire member 10 is provided across the first attachment member 2 and the second attachment member 7.

[0031] The base fitting 20 that constitutes the first attachment member 2 has a contact portion 21, a bent piece portion 24, and a support portion 26. The contact portion 21 is formed in a flat plate shape along the lower surface of the structure S. The contact portion 21 is arranged in contact with the structure S in a state of being in full contact. An insertion hole 21a is formed in the contact portion 21, and a wire 105 that constitutes the wire member 10 is inserted into the insertion hole 21a. The contact portion 21 has a notch 22 that is larger than the outer shape of a nut N (see FIG. 2) attached to the suspension bolt P in a state of being in contact with the structure S. The notch 22 is formed so as to be cut out in a U shape from the short side of the rectangular contact portion 21. Further, the contact portion 21 has a rib 23 formed so as to stand up along one side. The rib 23 is formed along one long side of the rectangular contact portion 21. The contact portion 21 is connected to the support portion 26 via the bent piece portion 24 at the long side portion opposite to the rib 23.

[0032] The support portion 26 is formed so as to extend downward along the suspension bolt P from the contact portion 21 via the bent piece portion 24. The support portion 26 is a part that supports the clamping fitting 30, and in this embodiment, it is also a part that supports the first brace clamping fitting 50. The clamping fitting 30 and the first brace clamping fitting 50 are supported separately on both sides of the support portion 26. A through hole 26a is formed in the support portion 26, and the shaft portion of the first connecting bolt 55 is inserted into the through hole 26a. Further, the support portion 26 has a curved piece portion 27 that is curved along the outer surface of the suspension bolt P. The curved piece portion 27 is arranged along the vertical direction. A plurality of locking protrusions 27A are formed to protrude from the inner surface of the curved piece portion 27.

[0033] In this embodiment, a support bent piece 28 is formed to protrude from the lower end portion of the support portion 26 toward the same side as the side where the curved piece portion 27 is curved. This support bent piece 28 supports the clamping fitting 30 connected to the support portion 26 from below.

[0034] The clamping fitting 30 clamps the suspension bolt P between it and the support portion 26. In the present embodiment, the clamping fitting 30 not only clamps the suspension bolt P between it and the support portion 26 but also serves as a portion for supporting the second brace clamping fitting 60. In the present embodiment, the clamping fitting 30 corresponds to the "clamping portion". The clamping fitting 30 has a superposed portion 31, a central curved portion 33, and an extended support portion 34. The superposed portion 31 is a portion superposed on the support portion 26 of the base fitting 20. A fastened portion 32 to which the first connecting bolt 55 is fastened is formed in the superposed portion 31. The fastened portion 32 may be constituted by, for example, a barring tap or may be constituted by fixing a nut.

[0035] The central curved portion 33 is provided between the superposed portion 31 and the extended support portion 34 and is formed to curve along the outer surface of the suspension bolt P. A plurality of locking protrusions 33A are protrudingly formed on the inner surface of the central curved portion 33. The central curved portion 33 is arranged so as to face the curved piece portion 27 of the support portion 26 in a state where the base fitting 20 and the clamping fitting 30 are fixed, and clamps the suspension bolt P at the facing portion. At this time, the locking protrusion 27A and the locking protrusion 33A are locked to the thread groove of the suspension bolt P.

[0036] The extended support portion 34 extends from the central curved portion 33 so as to intersect (orthogonally in this example) with the superposed portion 31 and the support portion 26 of the base fitting 20 superposed thereon. The extended support portion 34 serves as a portion for supporting the second brace clamping fitting 60. A fastened portion 35 to which the second connecting bolt 65 is fastened is formed in the extended support portion 34. The fastened portion 35 may be constituted by, for example, a barring tap or may be constituted by fixing a nut.

[0037] The first brace clamping fitting 50 sandwiches the first brace bolt Q1 between it and the support portion 26 of the base fitting 20. In the present embodiment, the first brace clamping fitting 50 corresponds to the "first brace clamping portion". The first brace clamping fitting 50 has a main body portion 51, a curved portion 52, and ribs 53. The main body portion 51 is a portion that is overlapped and fixed to the support portion 26 of the base fitting 20. A through hole 51a is formed in the main body portion 51, and the shaft portion of the first connection bolt 55 is inserted through this through hole 51a. An annular projection 51B that protrudes to the side opposite to the support portion 26 of the base fitting 20 is formed around the through hole 51a.

[0038] The curved portion 52 is continuously provided from the main body portion 51 and is curved along the outer surface of the first brace bolt Q1. A plurality of locking protrusions 52A are formed to protrude from the inner surface of the curved portion 52. The curved portion 52 is arranged so as to face the support portion 26 of the base fitting 20 in a state where the base fitting 20 and the first brace clamping fitting 50 are fixed, and sandwiches the first brace bolt Q1 at the facing portion. At this time, the locking protrusion 52A locks into the thread groove of the first brace bolt Q1. The ribs 53 are divided on both sides in the width direction of the first brace clamping fitting 50 and are respectively erected and formed across the main body portion 51 and the curved portion 52.

[0039] The base fitting 20, the clamping fitting 30, and the first brace clamping fitting 50 are connected and fixed by the first connection bolt 55. By inserting the shaft portion of the first connection bolt 55 through the through hole 51a of the main body portion 51 of the first brace clamping fitting 50 and the through hole 26a of the support portion 26 of the base fitting 20 and fastening it to the fastened portion 32 provided on the overlapping portion 31 of the clamping fitting 30, the base fitting 20, the clamping fitting 30, and the first brace clamping fitting 50 are connected and fixed. In the present embodiment, the first connection bolt 55 corresponds to the "connection bolt".

[0040] The first connecting bolt 55 is externally fitted with a washer 56 and a spring 57 in the described order from the head side. With such a configuration, in the loosened state of the first connecting bolt 55, the elastic restoring force of the compressed spring 57 can urge the first brace clamping fitting 50 and the base fitting 20 toward the clamping fitting 30 side. Thereby, the first attachment member 2 can be temporarily fixed to the suspension bolt P, and the first brace bolt Q1 can be temporarily fixed between the base fitting 20 and the first brace clamping fitting 50. In the final fixed state, the spring 57 is arranged in the internal space of the annular protrusion 51B formed in the main body portion 51 of the first brace clamping fitting 50 in a compressed state.

[0041] The second brace clamping fitting 60 sandwiches a second brace bolt Q2 different from the first brace bolt Q1 between it and the extended support portion 34 of the clamping fitting 30. In the present embodiment, the second brace clamping fitting 60 corresponds to the "second brace clamping portion". The second brace clamping fitting 60 has a main body portion 61, a curved portion 62, and ribs 63. The main body portion 61 is a portion that is overlapped and fixed to the extended support portion 34 of the clamping fitting 30. A through hole 61a is formed in the main body portion 61, and the shaft portion of the second connecting bolt 65 is inserted through the through hole 61a. An annular protrusion 61B protruding to the side opposite to the extended support portion 34 of the clamping fitting 30 is formed around the through hole 61a.

[0042] The curved portion 62 is continuously provided from the main body portion 61 and is curved along the outer surface of the second brace bolt Q2. A plurality of locking protrusions 62A are formed to protrude from the inner surface of the curved portion 62. The curved portion 62 is arranged to face the extended support portion 34 of the clamping fitting 30 in a state where the clamping fitting 30 and the second brace clamping fitting 60 are fixed, and sandwiches the second brace bolt Q2 at the facing portion. At this time, the locking protrusion 62A locks into the thread groove of the second brace bolt Q2. The ribs 63 are divided on both sides in the width direction of the second brace clamping fitting 60 and are erected so as to extend across the main body portion 61 and the curved portion 62 respectively.

[0043] The clamping fitting 30 and the second brace clamping fitting 60 are connected and fixed by a second connecting bolt 65. By inserting the shaft portion of the second connecting bolt 65 through the through hole 61a in the main body portion 61 of the second brace clamping fitting 60 and fastening it to the fastened portion 35 provided on the extended support portion 34 of the clamping fitting 30, the clamping fitting 30 and the second brace clamping fitting 60 are connected and fixed.

[0044] A washer 66 and a spring 67 are externally fitted to the second connecting bolt 65 in the described order from the head side. With such a configuration, in the loose state of the second connecting bolt 65, the second brace clamping fitting 60 can be urged toward the clamping fitting 30 side by the elastic restoring force of the compressed spring 67. Thereby, the second brace bolt Q2 can be temporarily fixed between the clamping fitting 30 and the second brace clamping fitting 60. In the final fixed state, the spring 67 is arranged in the internal space of the annular protrusion 61B formed on the main body portion 61 of the second brace clamping fitting 60 in a compressed state.

[0045] The second attachment member 7 has an equipment mounting fitting 70. The equipment mounting fitting 70 is fastened together with the mounting site Ea for the suspension bolt P provided on the side surface of the suspended equipment E. In the present embodiment, the equipment mounting fitting 70 corresponds to the "equipment mounting portion". The equipment mounting fitting 70 has a flat main body plate portion 71. An insertion hole 71a is formed in the main body plate portion 71, and a wire 105 constituting the wire member 10 is inserted through the insertion hole 71a. Further, the main body plate portion 71 has a notch 72 having a size larger than the outer diameter of the suspension bolt P and smaller than the nut M for fixing the mounting site Ea. The notch 72 is formed so as to be notched in a U shape from one side of the main body plate portion 71. Also, the equipment mounting fitting 70 has a first bent piece 73 and a second bent piece 74 bent upward from the main body plate portion 71.

[0046] The wire member 10 is provided across the first attachment member 2 and the second attachment member 7. In the present embodiment, a single wire 105 of a predetermined length is inserted through the insertion hole 21a of the contact portion 21 of the base fitting 20 and the insertion hole 71a of the main body plate portion 71 of the equipment attachment fitting 70, and then both ends are connected by a coupler (not shown) to form a loop shape as a whole.

[0047] In the fall prevention device 1 of the present embodiment, by simply bringing the contact portion 21 into contact with the structure S and sandwiching the suspension bolt P between the support portion 26 of the base fitting 20 and the clamping fitting 30, the first attachment member 2 can be easily fixed to the suspension bolt P. Therefore, the workability can be improved. Since the first connection bolt 55 for this fixing is fastened in a direction orthogonal to the suspension bolt P, for example, the fastening work can be performed using a power tool (the same applies to the fastening of the second connection bolt 65 for fixing the second brace clamping fitting 60). Therefore, also from this point, the workability can be greatly improved.

[0048] Also, by sandwiching the suspension bolt P between the support portion 26 and the clamping fitting 30 while bringing the contact portion 21 into contact with the structure S, the structure S and the first attachment member 2 can be made to act as an integral rigid body. Thereby, even if the suspension bolt P breaks when a large vibration acts, the break position can be made lower. For example, as shown in FIG. 4, normally, there is a possibility that the suspension bolt P breaks at the position of the lower end portion of the nut N that contacts the structure S (indicated by the symbol "A"), but the break position of the suspension bolt P can be made lower than the lower end portion of the base fitting 20 (indicated by the symbol "B").

[0049] Therefore, even if the suspension bolt P breaks, the first attachment member 2 maintains the state of being fixed to the suspension bolt P remaining on the structure S side. Therefore, the normal function of the fall prevention device 1 provided across the position directly below the structure S in the suspension bolt P and the attachment site Ea of the suspended equipment E can prevent the suspended equipment E from falling.

[0050] Furthermore, the fall arrester 1 of this embodiment further includes a first brace clamping fitting 50 and a second brace clamping fitting 60, thereby also functioning as a corner fitting that connects the suspension bolt P and two brace bolts Q intersecting therewith at the corner portion. Therefore, as a whole, it has a simple structure and can prevent the suspended equipment E from swaying and prevent it from falling in case of an emergency.

[0051] 〔Second Embodiment〕 A second embodiment of the fall arrester will be described with reference to the drawings. The specific structures of the first attachment member 2, the second attachment member 7, and the wire member 10 of the fall arrester 1 of this embodiment are different from those of the first embodiment. Hereinafter, the fall arrester 1 of this embodiment will be mainly described with respect to the differences from the first embodiment. Regarding points not specifically specified, they are the same as those of the first embodiment, and the same reference numerals are used and detailed descriptions are omitted.

[0052] As shown in FIG. 5, the fall arrester 1 of this embodiment is provided independently of the corner fitting C that connects the suspension bolt P and two brace bolts Q intersecting therewith. This fall arrester 1 is provided over a position directly below the structure S in the suspension bolt P and a position below the attachment portion Ea of the suspended equipment E.

[0053] As shown in FIGS. 6 and 7, in the fall arrester 1 of this embodiment, the first attachment member 2 includes a base fitting 20 and a clamping fitting 40. The fall arrester 1 is provided independently of the corner fitting C and, unlike the first embodiment, does not include a first brace clamping fitting 50 and a second brace clamping fitting 60. Further, the second attachment member 7 is directly attached to the suspension bolt P independently of the attachment portion Ea of the suspended equipment E and has a second base fitting 80 and a second clamping fitting 90 instead of the equipment attachment fitting 70 in the first embodiment.

[0054] The base metal fitting 20 constituting the first mounting member 2 has an abutment portion 21, a bent piece portion 24, and a support portion 26. The abutment portion 21 is formed in a flat plate shape along the lower surface of the structure S. The abutment portion 21 is disposed in abutment against the structure S in a state of contact over the entire surface. The abutment portion 21 of this embodiment does not have an insertion hole 21a (see FIG. 2) as in the first embodiment. The abutment portion 21 has a notch 22 that is larger than the outer shape of the nut N attached to the suspension bolt P in a state of abutting against the structure S. The abutment portion 21 also has a rib 23 formed upright along one side. The abutment portion 21 is connected to the support portion 26 via the bent piece portion 24 at the long side portion opposite the rib 23.

[0055] The support portion 26 is formed so as to extend downward from the contact portion 21 along the suspension bolt P via the bent piece portion 24. The support portion 26 serves as a portion that supports the clamping metal fitting 40. A through hole 26a is formed in the support portion 26, and the shaft portion of the third connecting bolt 45 is inserted into this through hole 26a. The support portion 26 also has a wire accommodating portion 25 that is formed in a groove shape so as to surround the periphery of the through hole 26a. A part of the first annular portion 101 of the wire member 10 is accommodated in this wire accommodating portion 25. The wire accommodating portion 25 also functions as a kind of rib, and also plays a role in increasing the strength of the support portion 26.

[0056] Furthermore, a support bent piece 28 is formed to protrude from the lower end of support portion 26 so as to protrude toward clamping metal fitting 40. This support bent piece 28 supports clamping metal fitting 40, which is connected to support portion 26, from below. Furthermore, a guide piece 29 is provided on one side of support portion 26 along the top and bottom of the suspension bolt P side, which is inclined toward the opposite side to clamping metal fitting 40. This guide piece 29 makes it easier to spread apart base metal fitting 20 and clamping metal fitting 40 when attaching first mounting member 2 to suspension bolt P, thereby facilitating the attachment.

[0057] The clamping fitting 40 has the same structure as the first brace clamping fitting 50 and the second brace clamping fitting 60 in the first embodiment. The clamping fitting 40 has a main body portion 41, a curved portion 42, and ribs 43. The main body portion 41 is a portion that is overlapped and fixed to the support portion 26 of the base fitting 20. A through hole 41a is formed in the main body portion 41, and the shaft portion of the third connecting bolt 45 is inserted through the through hole 41a. An annular protrusion 41B that protrudes to the side opposite to the base fitting 20 is formed around the through hole 41a.

[0058] The curved portion 42 is continuously provided from the main body portion 41 and is curved along the outer surface of the suspension bolt P. A plurality of locking protrusions 42A are protrudingly formed on the inner surface of the curved portion 42. The curved portion 42 is arranged so as to face the support portion 26 of the base fitting 20 in a state where the base fitting 20 and the clamping fitting 40 are fixed, and clamps the suspension bolt P at the facing portion. At this time, the locking protrusion 42A locks into the thread groove of the suspension bolt P. The ribs 43 are divided on both sides in the width direction of the clamping fitting 40 and are erected and formed across the main body portion 41 and the curved portion 42, respectively.

[0059] The base fitting 20 and the clamping fitting 40 are connected and fixed by the third connecting bolt 45. The shaft portion of the third connecting bolt 45 is inserted through the through hole 41a of the main body portion 41 of the clamping fitting 40 and the through hole 26a of the support portion 26 of the base fitting 20, and is fastened to a fastening nut (not shown) provided separately on the back side, whereby the base fitting 20 and the clamping fitting 40 are connected and fixed. At this time, the shaft portion of the third connecting bolt 45 is in a state of being inserted through the first annular portion 101 of the wire member 10 housed in the wire housing portion 25 of the support portion 26 of the base fitting 20. In this embodiment, the third connecting bolt 45 corresponds to the "connecting bolt", and the first annular portion 101 corresponds to the "annular portion".

[0060] A washer 46 and a spring 47 are externally fitted to the third connecting bolt 45 in the described order from the head side. With such a configuration, in the loosened state of the third connecting bolt 45, the clamping bracket 40 can be urged toward the base bracket 20 by the elastic restoring force of the compressed spring 47. As a result, the suspension bolt P can be temporarily fixed between the base bracket 20 and the clamping bracket 30 (the first attachment member 2 can be temporarily fixed to the suspension bolt P). In the final fixed state, the spring 47 is arranged in the internal space of the annular protrusion 41B formed in the main body portion 41 of the clamping bracket 40 in a compressed state.

[0061] The second base bracket 80 that constitutes the second attachment member 7 is arranged along the suspension bolt P. In the present embodiment, the second base bracket 80 corresponds to the "second support portion". The second base bracket 80 has a support main body portion 81, a support bent piece 82, and a guide piece 83. The support main body portion 81 is a part that supports the second clamping bracket 90. A through hole 81a is formed in the support main body portion 81, and the shaft portion of the fourth connecting bolt 95 is inserted through the through hole 81a. Further, the support main body portion 81 has a wire accommodating portion 85 formed in a groove shape so as to surround the periphery of the through hole 81a. A part of the second annular portion 102 of the wire member 10 is accommodated in the wire accommodating portion 85. The wire accommodating portion 85 also functions as a kind of rib and plays a role in increasing the strength of the support main body portion 81.

[0062] The support bent piece 82 is bent and formed so as to protrude from the upper end portion and the lower end portion of the support main body portion 81 toward the second clamping bracket 90 side. The support bent piece 82 supports the second clamping bracket 90 connected to the support main body portion 81 from both the upper and lower sides. The guide piece 83 is provided so as to incline toward the side opposite to the second clamping bracket 90 along one side of the support portion 26 along the suspension bolt P. The guide piece 83 facilitates the attachment by making it easy to expand the second base bracket 80 and the second clamping bracket 90 when attaching the second attachment member 7 to the suspension bolt P.

[0063] The second clamping fitting 90 clamps the suspension bolt P between itself and the second base fitting 80. In the present embodiment, the second clamping fitting 90 corresponds to the "second clamping portion". The second clamping fitting 90 has the same structure as the clamping fitting 40 that constitutes the first attachment member 2. The second clamping fitting 90 has a main body portion 91, a curved portion 92, and a rib 93. The main body portion 91 is a portion that is overlapped and fixed to the support main body portion 81 of the second base fitting 80. A through hole 91a is formed in the main body portion 91, and the shaft portion of the fourth connecting bolt 95 is inserted through the through hole 91a. An annular protrusion 91B that protrudes to the side opposite to the second base fitting 80 is formed around the through hole 91a.

[0064] The curved portion 92 is continuously provided from the main body portion 91 and is curved along the outer surface of the suspension bolt P. A plurality of locking protrusions 92A are formed to protrude from the inner surface of the curved portion 92. The curved portion 92 is arranged so as to face the support main body portion 81 of the second base fitting 80 in a state where the second base fitting 80 and the second clamping fitting 90 are fixed, and clamps the suspension bolt P at the opposing portion. At this time, the locking protrusion 92A locks into the thread groove of the suspension bolt P. The ribs 93 are separated on both sides in the width direction of the second clamping fitting 90 and are erected so as to extend across the main body portion 91 and the curved portion 92, respectively.

[0065] The second base fitting 80 and the second clamping fitting 90 are connected and fixed by the fourth connecting bolt 95. The shaft portion of the fourth connecting bolt 95 is inserted through the through hole 91a of the main body portion 91 of the second clamping fitting 90 and the through hole 81a of the support main body portion 81 of the second base fitting 80, and is fastened to a fastening nut (not shown) provided separately on the back side, whereby the second base fitting 80 and the second clamping fitting 90 are connected and fixed. At this time, the shaft portion of the fourth connecting bolt 95 is in a state of being inserted through the second annular portion 102 of the wire member 10 housed in the wire housing portion 85 of the support main body portion 81 of the second base fitting 80.

[0066] The fourth connecting bolt 95 is externally fitted with a washer 96 and a spring 97 in the order described from the head side. With such a configuration, in the loose state of the fourth connecting bolt 95, the elastic restoring force of the compressed spring 97 can bias the second clamping fitting 90 toward the second base fitting 80. Thereby, the suspension bolt P can be temporarily fixed between the second base fitting 80 and the second clamping fitting 90 (the second attachment member 7 can be temporarily fixed to the suspension bolt P). In the final fixed state, the spring 97 is disposed in the internal space of the annular protrusion 91B formed in the main body portion 91 of the second clamping fitting 90 in a compressed state.

[0067] The wire member 10 of the present embodiment has a first annular portion 101, a second annular portion 102, and a connecting portion 103 that connects these. The wire member 10 is formed using one wire and two small cylindrical bundling tools 106. With the two bundling tools 106 passed through the wire, both ends of the wire are looped and inserted into the corresponding bundling tools 106, and each bundling tool 106 is crimped, resulting in a structure in which the first annular portion 101 and the second annular portion 102 are connected by the connecting portion 103.

[0068] The first annular portion 101 is attached to the first attachment member 2. At this time, the first annular portion 101 is housed in the wire housing portion 25 formed in the support portion 26 of the base fitting 20, and is attached between the base fitting 20 and the clamping fitting 40 in a state where the shaft portion of the third connecting bolt 45 passes through the inside thereof.

[0069] The second annular portion 102 is attached to the second attachment member 7. At this time, the second annular portion 102 is housed in the wire housing portion 85 formed in the support main body portion 81 of the second base fitting 80, and is attached between the second base fitting 80 and the second clamping fitting 90 in a state where the shaft portion of the fourth connecting bolt 95 passes through the inside thereof.

[0070] Even with the fall arrester 1 of this embodiment, by bringing the contact portion 21 into contact with the structure S and sandwiching the suspension bolt P between the support portion 26 of the base fitting 20 and the clamping fitting 40, the first attachment member 2 can be easily fixed to the suspension bolt P. Similarly, even below the first attachment member 2, the second attachment member 7 can be easily fixed to the suspension bolt P by simply sandwiching the suspension bolt P between the second base fitting 80 and the second clamping fitting 90. Therefore, the workability can be improved. Since the third connecting bolt 45 and the fourth connecting bolt 95 for these fixings are fastened in a direction orthogonal to the suspension bolt P, for example, the fastening work can be performed using a power tool. Therefore, also from this point, the workability can be greatly improved.

[0071] Further, by sandwiching the suspension bolt P between the support portion 26 and the clamping fitting 40 while bringing the contact portion 21 into contact with the structure S, the structure S and the first attachment member 2 can be made to act as an integral rigid body. Thereby, even if the suspension bolt P breaks when a large vibration acts, the breaking position can be made lower.

[0072] For this reason, even if the suspension bolt P breaks, the normal function of the fall arrester 1 provided over the position directly below the structure S in the suspension bolt P and the position below the attachment portion Ea of the suspended equipment E can prevent the suspended equipment E from falling.

[0073] Furthermore, in the fall arrester 1 of this embodiment, the base fitting 20 and the clamping fitting 40 are connected with the third connecting bolt 45 inserted through the first annular portion 101, and the second base fitting 80 and the second clamping fitting 90 are connected with the fourth connecting bolt 95 inserted through the second annular portion 102. With such a configuration, the first attachment member 2, the second attachment member 7, and the wire member 10 can be connected without specially providing holes for passing the wires constituting the wire member 10 in the first attachment member 2 or the second attachment member 7.

[0074] 〔Third Embodiment〕 A third embodiment of the fall arrester will be described with reference to the drawings. The specific structure of the fall arrester 1 in this embodiment and the accompanying fall arrest structure are different from those of the first and second embodiments. Hereinafter, regarding the fall arrester 1 in this embodiment, the differences from the first embodiment will mainly be described. Regarding points not particularly specified, they are the same as those in the first embodiment, and the same reference numerals are given and detailed descriptions are omitted.

[0075] As shown in FIG. 8, the fall arrester 1 in this embodiment includes a first unit 1A installed near the structure S on the suspension bolt P, and a second unit 1B installed near the suspended equipment E on the suspension bolt P. The first unit 1A and the second unit 1B are provided independently of the corner fitting C that connects the suspension bolt P and the two brace bolts Q intersecting it.

[0076] The first unit 1A is provided over the position directly below the structure S on the suspension bolt P and the position between the upper corner fitting C and the lower corner fitting C. The first unit 1A includes a first attachment member 2, a second attachment member 7, and a wire member 10 that connects them. In this embodiment, the wire member 10 corresponds to the "first wire member". As the first unit 1A, one having the same structure as the fall arrester 1 in the second embodiment can be used.

[0077] The second unit 1B is provided across a position above the lower corner fitting C in the suspension bolt P and the attachment part Ea of the suspended equipment E, below the first unit 1A. The second unit 1B includes a third attachment member 13, a fourth attachment member 14, and a wire member 15 that connects these. In the present embodiment, the wire member 15 corresponds to the "second wire member". As shown in FIG. 9, as the third attachment member 13, one having the same structure as the second attachment member 7 (including the second base fitting 80, the second clamping fitting 90, and the fourth connection bolt 95; refer to FIG. 6) in the fall arrester 1 of the second embodiment can be used. Further, as the fourth attachment member 14, one having the same structure as the second attachment member 7 (equipment attachment fitting 70; refer to FIG. 2) in the fall arrester 1 of the first embodiment can be used.

[0078] When attaching a single fall arrester 1 across the vicinity of the structure S and the vicinity of the suspended equipment E as in the first embodiment and the second embodiment, it is necessary to adjust the length of the wire member 10 according to the suspension height of the suspended equipment E from the structure S. On the other hand, in the present embodiment, the first unit 1A and the second unit 1B constituting the fall arrester 1 can be attached independently to the upper and lower two corner fittings C provided on the suspension bolt P. Therefore, it is not necessary to adjust the lengths of the wire members 10 and 15. Thus, by using the fall arrester 1 of the present embodiment, the workability can also be improved in this regard.

[0079] 〔Other Embodiments〕 (1) The specific structure of the second attachment member 7 described in each of the above embodiments may be replaced as appropriate. For example, in the fall arrester 1 of the first embodiment, as the second attachment member 7, one having the same structure as that in the second embodiment may be used. Also, in the fall arrester 1 of the second embodiment, as the second attachment member 7, one having the same structure as that in the first embodiment may be used. Similarly, in the second unit 1B of the fall arrester 1 of the third embodiment, as the fourth attachment member 14, one having the same structure as the second attachment member 7 in the second embodiment may be used.

[0080] (2) The connection structures between the first attachment member 2 and the second attachment member 7 by the wire member 10 described in each of the above embodiments may be appropriately interchanged. For example, in the fall arrester 1 of the first embodiment, a first annular portion 101 similar to that of the second embodiment may be provided on the wire member 10, and the shaft portion of the first connection bolt 55 may be inserted through the first annular portion 101 to connect it to the first attachment member 2. Further, in the fall arrester 1 of the second embodiment, insertion holes may be formed in the base metal fitting 20 and the second base metal fitting 80, and the whole may be connected in a loop shape by passing a wire through them.

[0081] (3) In each of the above embodiments, the configuration in which the fall arrester 1 is provided in combination with the anti-sway structure of the suspension device E using the corner fitting C and the cross fitting X has been described as an example. However, without being limited to such a configuration, the fall arrester 1 may be applied to a suspension support structure in which the suspension device E is simply suspended and supported by the suspension bolt P. In such a case, the fall arrester 1 of the second embodiment, which is suitable for single use, can be preferably used.

[0082] (4) The configurations disclosed in each of the above-described embodiments (including the above embodiments and other embodiments; the same shall apply hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs. Regarding other configurations as well, all the embodiments disclosed in this specification are illustrative in all respects, and can be appropriately modified within the scope not departing from the gist of the present disclosure.

Description of Reference Numerals

[0083] 1 Fall arrester 1A First unit 1B Second unit 2 First attachment member 7 Second attachment member 10 Wire member (first wire member) 13 Third attachment member 14 Fourth attachment member 15 Wire member (second wire member) 21 Contact portion 26 Support portion 30 Clamping fitting (clamping part) 40 Clamping fitting (clamping part) 45 Third connection bolt (connection bolt) 50 First brace clamping fitting (first brace clamping part) 55 First connection bolt (connection bolt) 60 Second brace clamping fitting (second brace clamping part) 70 Equipment mounting fitting (equipment mounting part) 80 Second base fitting (second support part) 90 Second clamping fitting (second clamping part) 95 Fourth connection bolt 101 First annular part (annular part) S Structure N Nut E Suspended equipment Ea Mounting site P Suspension bolt Q Brace bolt Q1 First brace bolt Q2 Second brace bolt

Claims

1. A fall arrester for preventing the fall of suspended equipment suspended and supported by a suspension bolt hanging down from a structure, comprising: a contact portion arranged to contact the structure, a support portion extending downward along the suspension bolt from the contact portion, and a clamping portion for clamping the suspension bolt between the support portion and the clamping portion, a first attachment member; a second attachment member fixed to the suspension bolt at a mounting portion of the suspended equipment below the first attachment member or further below; a wire member provided across the first attachment member and the second attachment member; a nut is attached to the suspension bolt in a state of contacting the structure; the contact portion has a notch larger than the outer shape of the nut, and the fall arrester is arranged to contact the structure with the nut received in the notch.

2. The fall arrester according to claim 1, wherein the first attachment member further has a first brace clamping portion for clamping a first brace bolt intersecting the suspension bolt between the support portion, and a second brace clamping portion for clamping a second brace bolt intersecting the suspension bolt separately from the first brace bolt between the clamping portions.

3. The fall arrester according to claim 1 or 2, wherein the second attachment member has a device attachment portion that is fastened together with a mounting portion of the suspended equipment to the suspension bolt.

4. The fall arrester according to claim 1 or 2, wherein the second attachment member has a second support portion arranged along the suspension bolt, and a second clamping portion for clamping the suspension bolt between the second support portion.

5. The first attachment member further has a connecting bolt connecting the support portion and the clamping portion; the wire member has an annular portion formed in an annular shape at at least one end; The fall arrester according to any one of claims 1 to 4, wherein the connecting bolt connects the support portion and the clamping portion with the annular portion inserted therethrough.

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